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    <title>Document</title>
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    <script>
        new Vue({
            el: '#root',
            template: 
            `<div>
                <h2>当前的n值是：{{n}}</h2>
                <button @click="add">点我n+1</button> 
            </div>
                `,
            data: {
                n: 1
            },
            methods: {
                add() {
                    this.n++;
                }
            },
            beforeCreate() {
            },
            created() {
                debugger
            },
            beforeMount() {
                console.log('beforemount')

            },
            mounted() {
                
            },

        })

        // setInterval(() => {
        //     vm.opacity -= 0.01
        //     if (vm.opacity <= 0) vm.opacity = 1 
        // }, 16)
    </script>
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